CORTISOL BLOOD (COR)
: Competitive Binding Immunoenzymatic Assay
: Specimens collected before 10AM: 3.7-19.4mcg/dL; Specimens collected after 5 PM: 2.9-17.3
: Light green PST (Lithium Heparin with gel) tube - 4.5 mL
: Plasma, Serum
: Red top tube - 5 mL; EDTA
: 2 microtainers
: 3 mL plasma
: 0.7 mL plasma
: Centrifuge immediately and store at 2-8 degrees C.
: Refrigerated (2 - 8 C) : up to 14 days Frozen (-20 C) : 30 days Avoid multiple freeze/thaw cycles
Reasons for Rejection
: Hemolysis; improper collection
: STAT: 1 hour; ROUTINE: 2 hours after receiving in lab
: The Endocrine Society suggests a cut‐off of < 1.8 mcg/dL 8 hours after 1 mg‐Overnight Dexamethasone Suppression test or 2 hours after the last dose in the Longer Low‐dose Dexamethasone Suppression Test.
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